Comprehensive treatment device for steel slag

Abstract

The utility model discloses a comprehensive treatment device for steel slag. The comprehensive treatment device comprises a metal smelting furnace, a steel slag tundish, a granulating device, a process pump, a compressed air system and a fluidizing fan, an inlet of the steel slag tundish is connected with the metal smelting furnace, an outlet of the steel slag tundish is connected with an inlet of the granulating device, and an inlet of the granulating device is connected with outlets of the process pump, the compressed air system and the fluidization fan through pipelines. According to the utility model, the compressed air system and the high-pressure water are adopted to realize the uniform granulation of the steel slag, the hydrogen generated by the decomposition of the high-pressure water reduces the residual metal compounds in the steel slag, the separation of metals such as slag iron is realized, and meanwhile, the fluidization fan is arranged, so that the quenching cooling of the steel slag is realized, and the water resource consumed by quenching the slag is saved.

Description

Technical Field

[0001] The utility model belongs to the field of steel slag treatment and relates to a comprehensive steel slag treatment device. Background Art

[0002] The traditional liquid slag treatment method in the metallurgical field causes waste and pollution to resources and the environment.

[0003] According to the current industry treatment method, the 1500℃ liquid waste slag and high-temperature molten slag produced by the iron and steelmaking process are generally treated by water quenching or natural cooling. This not only wastes a lot of water resources and waste heat resources, but also causes a series of pollution problems such as the environment, water bodies, and dust.

[0004] At present, metallurgical slag (steel slag, blast furnace slag, carbide slag, etc.) is all quenched by wet method. High-temperature slag of about 1500℃~1800℃ is cooled by spraying water. It takes about 1 ton of water to quench 1 ton of high-temperature slag, which consumes a lot of water resources.

[0005] In the traditional semi-dry slag quenching method, the sensible heat recovery of steel slag is less than 10%, which can only be used to heat hot water. It is a low-grade sensible heat recovery and cannot produce high-quality steam. Utility Model Content

[0006] The utility model aims to overcome the disadvantages of the prior art and provide a comprehensive slag treatment device, which can rapidly cool the slag and save water resources consumed by quenching the slag.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A comprehensive slag processing device, comprising a metal smelting furnace, a slag tundish, a granulation device, a process pump, a compressed air system and a fluidizing fan;

[0009] The inlet of the slag tundish is connected to the metal smelting furnace, and the outlet is connected to the inlet of the granulating device. The inlet of the granulating device is respectively connected to the outlets of the process pump, the compressed air system and the fluidizing fan through pipelines.

[0010] Preferably, a slag constant temperature device is provided in the slag tundish.

[0011] Preferably, the granulation device is connected to the brick kiln via a high-temperature slag discharge system.

[0012] Furthermore, the granulation device is connected to a primary dust removal system through a smoke and air duct, the inlet of the primary dust removal system is connected to the return brick kiln, the outlet is connected to a waste heat boiler, and a boiler steam-water system is connected between the waste heat boiler and the granulation device through a steam-water pipeline.

[0013] Furthermore, the outlet of the waste heat boiler is connected to the inlet of the dust collector, and the outlet of the dust collector is connected to the chimney through the induced draft fan.

[0014] Furthermore, the outlet of the brick kiln is connected to the inlet of the slag ball separation system through the low-temperature slag discharge system, one end of the outlet of the slag ball separation system is connected to the tailings buffer tank, and the other end of the outlet is connected to the steel ball storage tank, the outlet of the leaching reactor is connected to the liquid-slag separator, one end of the outlet of the liquid-slag separator is connected to the inlet of the secondary tailings tank, and the other end of the outlet is connected to the inlet of the mineralization reactor, the inlet of the mineralization reactor is connected to the outlet of the flue gas distributor, the outlet is connected to the inlet of the mineralization separator, and the outlet of the mineralization separator is connected to the inlet of the finished product storage tank.

[0015] Further, the outlet of the mineralization separator is connected to the inlet of the leaching reactor.

[0016] Furthermore, the outlet of the brick kiln is connected to the inlet of the slag ball separation system through the low-temperature slag discharge system, the outlet of the slag ball separation system is connected to the tailings buffer tank, the outlet of the leaching reactor is connected to the liquid-slag separator, the outlet of the liquid-slag separator is connected to the inlet of the mineralization reactor, and the inlet of the mineralization reactor is connected to the outlet of the flue gas distributor.

[0017] Further, the outlet of the mineralization separator is connected to the inlet of the leaching reactor.

[0018] Furthermore, the outlet of the slag ball separation system is connected to a steel ball storage tank.

[0019] Furthermore, the liquid-slag separator outlet is connected to the secondary tailings tank inlet.

[0020] Furthermore, the outlet of the mineralization reactor is connected to the inlet of the mineralization separator, and the outlet of the mineralization separator is connected to the inlet of the finished product storage tank.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model adopts a compressed air system and high-pressure water to achieve uniform granulation of steel slag. The hydrogen generated by the decomposition of high-pressure water reduces the residual metal compounds in the steel slag, and realizes the separation of slag, iron and other metals. At the same time, a fluidizing fan is equipped to achieve rapid cooling of the steel slag, saving water resources consumed by quenching the slag.

[0023] Furthermore, to ensure that the high-temperature liquid slag does not solidify and maintains fluidity in the slag tundish, a slag constant temperature device is required to keep it warm.

[0024] Furthermore, by utilizing the secondary heat exchange in the brick kiln, the waste heat of the waste slag can be deeply recovered, thus improving the economic benefits.

[0025] Furthermore, the flue gas from the granulation device and the brick kiln cooling the high-temperature slag enters the waste heat boiler through primary dust removal to achieve sensible heat recovery of the high-temperature slag, and finally produces medium-temperature and medium-pressure or high-temperature and high-pressure superheated steam through the boiler steam-water system for power generation, etc.

[0026] Furthermore, the separated tailings are selectively extracted with special chemical liquid to extract calcium oxide from the tailings. The calcium-based solution can absorb and consume carbon dioxide in the flue gas in the factory area, which can not only reduce carbon dioxide emissions, but also produce light calcium carbonate and nano calcium carbonate, which can be used in food, cement, papermaking, adhesives, pharmaceuticals and other fields, greatly increasing the added value of steel slag resources.

[0027] Furthermore, the chemical liquid in the mineralization reactor can be returned to the leaching reactor for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the device for comprehensive utilization of sensible heat recovery and carbon fixation of steel slag according to the utility model.

[0029] Among them: 1. Converter metal smelting furnace; 2. Steel slag constant temperature device; 3. Steel slag tundish; 4. Granulation device; 5. Process pump; 6. Compressed air system 4; 7. Fluidizing fan; 8. High-temperature slag discharge system; 9. Brick return kiln; 10. Blower; 11. Primary dust removal system; 12. Waste heat boiler; 13. Dust collector; 14. Chimney; 15. Induced draft fan; 16. Low-temperature slag discharge system; 17. Slag ball separator; 18. Tailings buffer tank; 19. Steel ball storage tank; 20. Leaching reactor; 21. Liquid-slag separator; 22. Secondary tailings storage tank; 23. Mineralization reactor; 24. Flue gas distributor; 25. Mineralization separator; 26. Finished product storage tank; 27. Boiler steam-water system. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected, electrically connected, or can communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, and they can be internally connected between two elements or interactive relationships between two elements. The term "and / or" used in this article includes any and all combinations of one or more related listed items. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0035] like Figure 1 As shown, the comprehensive slag processing device described in the utility model includes a metal smelting furnace 1, a slag constant temperature device 2, a slag tundish 3, a granulation device 4, a process pump 5, a compressed air system 6, a fluidizing fan 7, a boiler steam-water system 27 and a brick return kiln 9.

[0036] The inlet of the slag tundish 3 is connected to the metal smelting furnace 1 , and the outlet is connected to the inlet of the granulating device 4 .

[0037] A slag constant temperature device 2 is provided in the slag tundish 3, and the inlet of the granulation device 4 is connected to the outlets of the process pump 5, the compressed air system 6 and the fluidizing fan 7 through pipelines.

[0038] The granulating device 4 is a device for granulating materials and is connected to the primary dust removal system 11 through the smoke and air duct, and is connected to the brick kiln 9 through the high-temperature slag discharge system 8 and is connected to the boiler steam-water system 27 .

[0039] The inlet of the primary dust removal system 11 is connected to the granulation device 4 and the brick return kiln 9 , and the outlet is connected to the waste heat boiler 12 .

[0040] The outlet of the dust collector 13 is connected to the chimney 14 through the induced draft fan 15, and the inlet is connected to the outlet of the waste heat boiler 12.

[0041] The waste heat boiler 12 is connected to the boiler steam-water system 27 via a steam-water pipeline.

[0042] One end of the return brick kiln 9 is connected to the blower 10, and the outlet is connected to the inlet of the slag ball separation system 17 through the low-temperature slag discharge system 16.

[0043] One end outlet of the slag ball separation system 17 is connected to the tailings buffer tank 18 , and the other end outlet is connected to the steel ball storage tank 19 .

[0044] The outlet of the leaching reactor 20 is connected to the liquid-slag separator 21 , and the inlet is connected to the mineralization separator 25 .

[0045] One end outlet of the liquid-slag separator 21 is connected to the inlet of the secondary tailings tank 22 , and the other end outlet is connected to the inlet of the mineralization reactor 23 .

[0046] The inlet of the mineralization reactor 23 is connected to the outlet of the flue gas distributor 24 , and the outlet is connected to the inlet of the mineralization separator 25 .

[0047] One outlet of the mineralization separator 25 is connected to the finished product storage tank 26 , and the other outlet is connected to the inlet of the leaching reactor 20 .

[0048] Among them, the metal smelting furnace 1 pours the high-temperature molten liquid slag into the slag ladle 3 through mechanical equipment. The slag ladle 3 serves as a buffer device to continuously provide high-temperature liquid slag to the granulation device 4. The high-temperature liquid slag is in the slag ladle 3. To ensure that it does not solidify and maintains fluidity, the slag constant temperature device 2 needs to be used to continuously keep it warm.

[0049] Among them, the granulation device 4 is the core equipment for sensible heat recovery and granulation reaction. Water is sprayed on the high-temperature slag through the process pump 5. The iron and other metal compounds in the steel slag are reduced to metal elements through chemical reactions at high temperatures, and at the same time, it has the purpose of degrading active calcium oxide in the steel slag.

[0050] The compressed air system 6 is connected to the granulation device 4 through a pipeline, and its main purpose is to uniformly granulate the liquid slag into uniform and fine particles.

[0051] Among them, the fluidizing fan 7 is connected to the granulating device 4 through a pipeline, and its main purpose is to absorb the heat of the high-temperature slag, cooperate with the process pump 5 and the compressed air system 6 to quickly cool the slag, so that the high-temperature liquid slag of 1500°C is quickly cooled to 500~800°C.

[0052] Among them, after the high-temperature molten slag is cooled by the granulation device 4, it is transported to the heat exchange equipment of the brick kiln 9 through the high-temperature slag discharge system 8 to perform secondary heat exchange on the slag. Finally, the high-temperature slag is cooled to 100~200℃ for subsequent resource processing.

[0053] Among them, the granulation device 4, the return brick kiln 9, the waste heat boiler 12 and the boiler steam-water system 27 together constitute a sensible heat recovery device. The smoke and air from the granulation device 4 and the return brick kiln 9 that cool the high-temperature slag enter the waste heat boiler 12 through the primary dust removal system 11 to achieve sensible heat recovery of the high-temperature slag, and finally produce medium-temperature and medium-pressure or high-temperature and high-pressure superheated steam through the boiler steam-water system 27 for power generation, etc.

[0054] The steel slag after cooling and heat exchange is sent to the slag ball separation system 17 through the low-temperature slag discharge system 16. The steel balls in the steel slag are completely separated and enter the steel ball storage tank 19 for rust removal and other borax raw materials. The separated tailings enter the tailings buffer tank 18 for further carbon fixation resource treatment.

[0055] Among them, the tailings leaching reactor 20 is connected to the tailings buffer tank 18 and the liquid-slag separator 21. The amino composite liquid is added to the leaching reactor 20 to selectively extract calcium oxide in the tailings for subsequent mineralization reactions. After separation in the liquid-slag separator 21, the extracted chemical liquid enters the mineralization reactor 23, and the unextracted tailings enter the secondary tailings tank 22. After treatment, it can be used for building materials, cement raw materials, etc.

[0056] Among them, the inlet of the mineralization reactor 23 is connected to the liquid phase outlet of the liquid-slag separator 21 and the outlet of the flue gas distributor 24, and the outlet is connected to the mineralization separator 25. The main purpose of the mineralization reactor 23 is to pass the waste gas containing carbon dioxide in the factory area into the mineralization reactor 23 through the flue gas distributor 24, react with calcium compounds, and produce light calcium carbonate and nano calcium carbonate through reaction control.

[0057] The chemical liquid in the mineralization separator 25 can be returned to the leaching reactor 20 for recycling.

[0058] The inlet of the mineralization separator 25 is connected to the outlet of the mineralization reactor 23, and the outlet is connected to the finished product storage tank 26, and its main purpose is to separate calcium carbonate from the chemical liquid.

[0059] The process route of the utility model steel slag comprehensive treatment device adopts "metal smelting furnace 1--steel slag tundish 3--granulation device 4--brick kiln 9--slag ball separator 17-tailings buffer tank 18--leaching reactor 20--liquid slag-separator 21--mineralization reactor 23--mineralization separator 25--finished product storage tank 26; granulation device 4 / brick kiln 9--primary dust removal system 11--waste heat boiler 12 / boiler steam-water system 27--dust collector 13--chimney 14".

[0060] The working principle of the sensible heat recovery of steel slag of the utility model is as follows: the temperature of the steel slag discharged during the smelting process is about 1500~1800℃, and the liquid molten slag is cooled to 500~800℃ by the flue gas and the like through the granulating device 4. On the one hand, the high-temperature slag is evenly granulated by the compressed air system 6 through the control in the granulating device 4, and at the same time, the metal compounds in the metallurgical slag are reduced to metal elements to achieve the separation of steel and slag. At the same time, the granulated waste slag is secondary cooled by returning to the brick kiln 9. After the primary granulation cooling and the secondary return to the brick kiln cooling medium flue gas are collected, medium-temperature medium-pressure or high-temperature high-pressure superheated steam is produced through the waste heat boiler 12 for power generation, etc. This technology realizes the full dry sensible heat recovery of steel slag, while avoiding the waste of water resources and environmental pollution of traditional wet slag quenching, and achieving comprehensive benefits of energy and environmental protection.

[0061] The working principle of the steel slag carbon fixation of the utility model is: the tailings after the steel slag is separated pass through the leaching reactor 20, the calcium oxide in the steel slag is dissolved in the leaching chemical liquid, the flue gas containing carbon dioxide is introduced into the chemical liquid after the leaching, the carbon dioxide in the flue gas reacts with the calcium ions to generate light calcium carbonate and nano calcium carbonate, thereby realizing the steel slag carbon fixation, reducing the carbon dioxide emission, and realizing carbon reduction and steel slag resource utilization.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0063] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of the subject matter, nor should it be considered that the applicant has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A comprehensive slag treatment device, characterized in that: It comprises a metal smelting furnace (1), a slag tundish (3), a granulation device (4), a process pump (5), a compressed air system (6) and a fluidizing fan (7); The inlet of the slag tundish (3) is connected to the metal smelting furnace (1), and the outlet is connected to the inlet of the granulation device (4). The inlet of the granulation device (4) is connected to the outlets of the process pump (5), the compressed air system (6) and the fluidizing fan (7) through pipelines respectively; The granulation device (4) is connected to a return brick kiln (9) via a high-temperature slag discharge system (8); The granulating device (4) is connected to a primary dust removal system (11) via a smoke and air duct, the inlet of the primary dust removal system (11) is connected to the return brick kiln (9), and the outlet is connected to a waste heat boiler (12), and a boiler steam-water system (27) is connected between the waste heat boiler (12) and the granulating device (4) via a steam-water pipeline; The outlet of the return brick kiln (9) is connected to the inlet of the slag ball separation system (17) through the low-temperature slag discharge system (16), the outlet of the slag ball separation system (17) is connected to the tailings buffer tank (18), the outlet of the leaching reactor (20) is connected to the liquid-slag separator (21), the outlet of the liquid-slag separator (21) is connected to the inlet of the mineralization reactor (23), and the inlet of the mineralization reactor (23) is connected to the outlet of the flue gas distributor (24).

2. The comprehensive slag treatment device according to claim 1, characterized in that: A steel slag constant temperature device (2) is provided in the steel slag tundish (3).

3. The comprehensive slag treatment device according to claim 1, characterized in that: The outlet of the waste heat boiler (12) is connected to the inlet of the dust collector (13), and the outlet of the dust collector (13) is connected to the chimney (14) via the induced draft fan (15).

4. The comprehensive slag treatment device according to claim 1, characterized in that: The outlet of the mineralization separator (25) is connected to the inlet of the leaching reactor (20).

5. The comprehensive slag treatment device according to claim 1, characterized in that: The outlet of the slag ball separation system (17) is connected to a steel ball storage tank (19).

6. The comprehensive slag treatment device according to claim 1, characterized in that: The outlet of the liquid-slag separator (21) is connected to the inlet of the secondary tailings tank (22).

7. The comprehensive slag treatment device according to claim 1, characterized in that: The outlet of the mineralization reactor (23) is connected to the inlet of the mineralization separator (25), and the outlet of the mineralization separator (25) is connected to the inlet of the finished product storage tank (26).

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